Detailed Instructions: In this task, you are given a context and four options. Each option is a suggested ending for the context. You should read the context and pick the best ending for the context. Please answer with "A", "B", "C", and "D". 
Q: [header] How to update blackberry software [title] Navigate to the home screen and select " options. [title] Select " device, " then select " software updates. [title] Select the latest software update displayed on-screen, then tap on " download. <sep> (A) [substeps] Some wireless service providers have restrictions in place that may prevent you from installing the latest software updates over the air. Update your blackberry software using method two if you are unable to install ota updates using your device. (B) [title] Download the latest version of blackberry software from the blackberry website. [step] If you have not downloaded the latest version, you will be directed to the blackberry website. (C) [title] Launch the software update program on your computer. [step] Tap on the application name, then enter the terms of use for the version of blackberry software you want to update. (D) [title] Wait for blackberry update to finish installing. [title] Tap on " update, " then select " for updates.
A:
A